code optimization

[d-code-h]

My name is Habeeb, with due respect to the owner of this project, i made the following fixes to the code:

• Group files into folders for easy future maintenance
• Change constant variable declaration to 'const' rather than 'var'
• Ensure proper commenting of code blocks
• Organize code to their respective sections such as JavaScript codes being in a .js file rather than at the footer of a .html file
• Ensure a DRY code by removing repetitive variable declarations.

Thanks for the privilege, i remain my humble self.

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[rajivranjanmars]

First of all thanks for your hardwork and awesome contribution ,Thanks for all the efforts and changes but The GitHub pages won't work properly if you remove index.html from the base source . Please change the Pull request without putting index.html in any folder